Alkali silicate glass
CA 2239861 C · Owner: Ivoclar Ag · Inventors: Rheinberger, Volker; Frank, Martin; Holand, Wolfram
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alkali silicate glasses are described which in view of their good, chemical stability and their optical properties and processing properties are, particularly suitable as a coating or veneering material for ceramic dental frameworks and hence for the production of all-ceramic dental restorations such as crowns or bridges. The alkali silicate glasses each contain the following components:, Component Wt. %, SiO2 55.0 to 71.0 Al2O3 5.0 to 16.0, B2O3 0.2 to 10.0, K2O 4.5 to 10.0 Na2O 3.0 to 14.0, A preferred form of these glasses contain at least one of the following components:, Component Wt.%, CaO 0 to 3.0 F 0 to 3.0, P2O5 0 to 0.6, Li2O 0 to 4.0 BaO 0 to 5.0, ZnO 0 to 4.0, TiO2+Zro2 0.2 to …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 8, 1998 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.